<p>
The Random Data Generator uses Brownian motion to generate the data prices. You can see how these prices and ticker strings 
are generated in the 
<a href="https://github.com/QuantConnect/Lean/blob/master/ToolBox/RandomDataGenerator/RandomValueGenerator.cs#L13">RandomValueGenerator class</a>.
</p>

<p>
If you'd like to use a different system for providing the randomness you can implement your own <code>IRandomValueGenerator</code> or 
extend the <code>RandomValueGenerator</code> class.
</p>
